The five steps listed below are involved in excitation-contraction coupling
1. A wave of depolarization passes through the T-tubules.
2. Ca2+ binds to and causes a conformational change in troponin.
3. Tropomyosin moves to expose myosin-binding sites on the actin.
4. Ca2+ is released from the sarcoplasmic reticulum.
5. Cross-bridges form and produce a contraction.
Which of the following lists the steps in the correct order of events?
A. 1, 4, 2, 3, 5
B. 4, 5, 2, 1, 3
C. 1, 2, 4, 3, 5
D. 5, 4, 1, 2, 3
E. 2, 1, 3, 5, 4
A
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A trait with variable expressivity is one that:
A. is only expressed in homozygous recessive individuals. B. is only expressed in homozygous dominant individuals. C. is only expressed in some of the individuals that have the genotype for that trait. D. is expressed in only some offspring of affected individuals. E. can be expressed differently in different individuals that have the genotype for that trait.
The influence of density-independent factors on populations is generally less predictable than the influence of density-dependent factors
Indicate whether the statement is true or false
You are most likely to see hag fish, sperm whales, and viperfish inhabiting which of the following zones of the ocean?
a. abyssal b. bathypelagic c. epipelagic d. mesopelagic
Why is DNA polymerase from Thermus aquaticus ideal for PCR?
a. It can synthesize DNA 5' to 3' and 3' to 5'. b. It does not require primers. c. It can withstand the high temperatures associated with PCR. d. It does not require energy to polymerize DNA.